/*!	 layerparamset.cpp
**	 Template File
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/general.h>

#include "layerparamset.h"
#include <synfigapp/canvasinterface.h>

#include <synfigapp/localization.h>

#endif

using namespace std;
using namespace etl;
using namespace synfig;
using namespace synfigapp;
using namespace Action;

ACTION_INIT(Action::LayerParamSet);
ACTION_SET_NAME(Action::LayerParamSet, "LayerParamSet");
ACTION_SET_LOCAL_NAME(Action::LayerParamSet, N_("Set Layer Parameter"));
ACTION_SET_TASK(Action::LayerParamSet, "set");
ACTION_SET_CATEGORY(Action::LayerParamSet, Action::CATEGORY_LAYER);
ACTION_SET_PRIORITY(Action::LayerParamSet, 0);
ACTION_SET_VERSION(Action::LayerParamSet, "0.0");
ACTION_SET_CVS_ID(Action::LayerParamSet, "$Id$");

Action::LayerParamSet::LayerParamSet()
{
}

Action::ParamVocab
Action::LayerParamSet::get_param_vocab()
{
    ParamVocab ret(Action::CanvasSpecific::get_param_vocab());

    ret.push_back(ParamDesc("layer", Param::TYPE_LAYER)
                  .set_local_name(_("Layer"))
                 );

    ret.push_back(ParamDesc("param", Param::TYPE_STRING)
                  .set_local_name(_("Param"))
                 );

    ret.push_back(ParamDesc("new_value", Param::TYPE_VALUE)
                  .set_local_name(_("ValueBase"))
                 );

    return ret;
}

bool
Action::LayerParamSet::is_candidate(const ParamList &x)
{
    return candidate_check(get_param_vocab(), x);
}

bool
Action::LayerParamSet::set_param(const synfig::String& name, const Action::Param &param)
{
    if (name == "layer" && param.get_type() == Param::TYPE_LAYER) {
        layer = param.get_layer();

        return true;
    }

    if (name == "new_value" && param.get_type() == Param::TYPE_VALUE) {
        new_value = param.get_value();

        return true;
    }

    if (name == "param" && param.get_type() == Param::TYPE_STRING) {
        param_name = param.get_string();

        return true;
    }

    return Action::CanvasSpecific::set_param(name, param);
}

bool
Action::LayerParamSet::is_ready()const
{
    if (!layer || !new_value.is_valid() || param_name.empty()) {
        return false;
    }

    return Action::CanvasSpecific::is_ready();
}

void
Action::LayerParamSet::perform()
{
    // See if the parameter is dynamic
    if (layer->dynamic_param_list().count(param_name)) {
        throw Error(_("ValueNode attached to Parameter."));
    }

    old_value = layer->get_param(param_name);

    // We shouldn't change the parameters properties when change its value
    new_value.copy_properties_of(old_value);

    if (!layer->set_param(param_name, new_value)) {
        throw Error(_("Layer did not accept parameter."));
    }


    layer->changed();

    // Signal that a layer has been inserted
    if (get_canvas_interface()) {
        get_canvas_interface()->signal_layer_param_changed()(layer, param_name);
    }
}

void
Action::LayerParamSet::undo()
{
    if (!layer->set_param(param_name, old_value)) {
        throw Error(_("Layer did not accept parameter."));
    }



    layer->changed();

    // Signal that a layer has been inserted
    if (get_canvas_interface()) {
        get_canvas_interface()->signal_layer_param_changed()(layer, param_name);
    }
}